Polarized electromagnetic device

Abstract

Having a core wound with the magnetizing winding, and a yoke separated from the core, and an armature which has the permanent magnets, both pole pieces of the core and the facing-surfaces of the yoke being positioned apart in a predetermined space; in said space the magnetic poles of the permanent magnets being stationed; and through a joint-work of the magnetic flux created by the magnetizing winding and the armature flux created by the permanent magnets the armature is made to relatively reverse-displace against the core and the yoke.

What is claimed is: 
     
       1. A polarized electromagnetic device comprising: a core made of a soft-magnetic material and wound with a magnetizing winding for generating magnetic flux in a first direction in response to excitation by a first voltage polarity and for generating magnetic flux in a second direction opposite to said first direction in response to excitation by a second voltage polarity opposite said first voltage polarity, said core including a pair of separated pole pieces;   a yoke, made of the same material as said core, being separated from said core to define an air gap, said yoke having facing-surfaces opposingly disposed to said pair of pole pieces of said core through said air gap so as to be magnetically connected with said core through said air gap to form a first closed magnetic path of magnetic flux generated by said magnetizing winding; and   an armature including a body having a permanent magnet, both magnetic poles of said permanent magnet being disposed in said air gap so as to form second and third closed magnetic paths with said core through said air gap and with said yoke through said air gap, respectively, said armature mounted so as to pivotally move said both magnetic poles between said pole pieces of said core and said facing-surfaces of said yoke; wherein   when said magnetizing winding is excited to generate magnetic flux in said first direction, the magnetic flux in said first closed magnetic path opposes magnetic flux in said third closed path so as to allow said magnetic poles of said permanent magnet to be attracted to said core, and when said magnetizing winding is excited to generate magnetic flux in said second direction, the magnetic flux in said first closed magnetic path opposes magnetic flux in said second closed path so as to allow said magnetic poles of said permanent magnet to be attracted to said yoke.   
     
     
       2. A polarized electromagnetic device according to claim 1, wherein said core and said yoke are substantially planar in shape, and fixed relative to one another in a spaced-apart, parallel relationship, and wherein said armature includes means for mounting said permanent magnet in non-magnetic material, said armature being constructed in a rectangular planar shape, and including pivot means defining a pivot axis to permit pivotal movement thereof between said core and said yoke. 
     
     
       3. A polarized electromagnetic device according to claim 1 wherein said armature includes a pair of rod-shaped permanent magnets, wherein said pair of rod-shaped magnets are disposed parallel to the pivot axis of said armature and positioned symmetrically about said axis, and wherein the polarity of said pair of rod-shaped permanent magnets is mutually opposite to one another, the magnetic poles in either of said pair of rod-shaped permanent magnets respectively corresponding to both said pole pieces of said core. 
     
     
       4. A polarized electromagnetic device according to claim 1 wherein said armature includes a pair of rod-shaped permanent magnets, wherein said pair of rod-shaped permanent magnets respectively intercrossing perpendicularly with said pivot axis of said armature, and wherein each center of each said pair of rod-shaped permanent magnets being intersected by said axis, and wherein the polarity of said pair of rod-shaped permanent magnets is mutually opposite to one another, one of said pair of rod-shaped permanent magnets corresponding to the magnetic pole of one of said pair of pole pieces of said core, while the other of said pair of rod-shaped permanent magnets corresponds to the magnetic pole of the other of said pair of pole pieces of said core.